<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	</head>
	<body>
		
		<script>
//			
			var i =true;
//			alert(typeof i);
			var i1 = 1;
//			alert(typeof i1);
			var i2 = "1222";
//			alert(typeof i2);
			var i3 = null;
//			alert(typeof i3);
			var i4 = 45+"a";
			var i5 = 23+false;
			var i6 = true+"a";
			alert(i+i1+i2+i3+i4+i5);//21222null45a23
			
			
		</script>
		
	</body>
</html>
